WO2020134837A1 - 电池模组 - Google Patents

电池模组 Download PDF

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Publication number
WO2020134837A1
WO2020134837A1 PCT/CN2019/121588 CN2019121588W WO2020134837A1 WO 2020134837 A1 WO2020134837 A1 WO 2020134837A1 CN 2019121588 W CN2019121588 W CN 2019121588W WO 2020134837 A1 WO2020134837 A1 WO 2020134837A1
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WO
WIPO (PCT)
Prior art keywords
connection piece
fixed connection
battery
battery module
piece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2019/121588
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English (en)
French (fr)
Inventor
吴岸为
李东
王兴
徐慧晖
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Publication of WO2020134837A1 publication Critical patent/WO2020134837A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • This application relates to the technical field of energy storage devices, in particular to a battery module.
  • the present application provides a battery module to solve the connection reliability problem between the connection piece and the battery pole.
  • This application provides a battery module, which includes:
  • a plurality of secondary batteries, the plurality of secondary batteries are sequentially arranged along the thickness direction, and a battery pole is provided on the top of each secondary battery;
  • connection piece is provided on the top of the secondary battery, and the connection piece is connected with at least two battery poles to electrically connect at least two of the secondary batteries;
  • connection piece includes a first fixed connection piece and a second fixed connection piece, and along the extending direction of the connection piece, the first fixed connection piece and the second fixed connection piece are snap-fitted.
  • the edge of the first fixed connection piece is provided with a depression
  • the edge of the second fixed connection piece is provided with a protrusion matching the depression
  • the second fixed connection piece includes a transition connection piece and a third fixed connection piece, the protrusion is formed on the transition connection piece, and the transition connection piece connects the first fixed connection piece with the The third fixed connection piece is connected.
  • the depression penetrates the first fixed connection piece along the thickness direction of the first fixed connection piece, and the protrusion has the same thickness as the second fixed connection piece.
  • the depression includes two inner side walls, and a bottom wall connecting the two inner side walls;
  • the protrusion includes two outer side walls, and a top wall connecting the two outer side walls;
  • the inner side wall is in contact with the outer side wall.
  • the inner side wall and the outer side wall are meshed with each other through a tooth structure, and the tooth structure extends along the thickness direction of the connecting piece.
  • the distance between the two inner side walls gradually decreases; in a direction away from the top wall, the distance between the two outer side walls gradually decreases.
  • the recess includes a dovetail groove
  • the protrusion includes a dovetail block cooperating with the dovetail groove
  • a gap is formed between the bottom wall and the top wall.
  • the gap is located at the top of the battery pole and does not exceed the edge of the battery pole.
  • the battery module provided by the present application includes a plurality of secondary batteries, and the plurality of secondary batteries are connected in series and/or in parallel through a connection piece; wherein, the connection piece includes a first fixed connection piece and a second fixed connection piece, the first fixed connection And the second fixed connection piece are respectively connected to different battery poles, and the separate arrangement of the connection piece enables the connection surfaces of the first fixed connection piece and the second fixed connection piece and the battery poles to be located on planes with different heights.
  • FIG. 1 is a schematic structural diagram of a battery module provided by an embodiment of this application.
  • FIG. 2 is a top view of the battery module shown in FIG. 1;
  • FIG. 3 is another schematic structural diagram of a battery module provided by an embodiment of the present application.
  • FIG. 4 is a partial structural diagram of a connector provided by an embodiment of this application.
  • FIG. 5 is another partial structural diagram of a connector provided by an embodiment of this application.
  • FIG. 6 is a schematic cross-sectional structural diagram of a connector provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of another cross-sectional structure of a connector provided by an embodiment of the present application.
  • FIG. 8 is a schematic diagram of the structure shown in FIG. 7 after welding is completed.
  • connection refers to two or more; the terms “connection”, “fixed”, etc. should be broadly understood, for example, “connection” may be a fixed connection, It can also be a detachable connection, or an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium.
  • an embodiment of the present application provides a battery module, which includes a plurality of secondary batteries 1 and a connecting sheet 2.
  • a plurality of secondary batteries 1 are sequentially arranged along the thickness direction, and a fixing device may be provided around the plurality of secondary batteries 1 to fix the secondary battery 1, and a battery pole 10 is provided on the top of each secondary battery 1;
  • a connecting piece 2 and at least two battery poles 10 are used to electrically connect at least two secondary batteries.
  • the connection piece 2 includes a first fixed connection piece 2a and a second fixed connection piece 2b.
  • the first fixed connection piece 2a and the second fixed connection piece 2b are respectively connected to different battery poles 10, and are separated by the connection piece 2
  • the arrangement makes the connection surface of the first fixed connection piece 2a and the second fixed connection piece 2b and the battery pole 10 can be located on a plane with different heights, can absorb the error of the battery in the height direction, and ensure that the connection piece 2 is reliably connected to the battery pole 10 ;
  • the first fixed connecting piece 2a and the second fixed connecting piece 2b snap fit, increasing the first fixed connecting piece 2a and
  • the reliability of the connection of the second fixed connection piece 2b prevents the first fixed connection piece 2a from being separated from the second fixed connection piece 2b under the action of the battery expansion force, resulting in the failure of the connection piece 2.
  • one of the first fixed connection piece 2a and the second fixed connection piece 2b may be provided with a clamping hole, and the other may be provided with a clamping block that cooperates with the clamping hole.
  • the clamping hole has a certain depth along the thickness direction of the connecting piece 2, and the clamping block has a certain thickness along the thickness direction of the connecting piece 2; along the thickness direction of the connecting piece 2, due to the guiding effect of the cooperation between the clamping block and the clamping hole, the first A fixed connection piece 2a and a second fixed connection piece 2b can be installed and absorb the error in the height direction of the battery; along the extension direction of the connection piece 2, due to the clamping action of the clamping block and the clamping hole, the first fixed connection The piece 2a and the second fixed connection piece 2b cannot be detached, ensuring the reliability of the connection piece 2.
  • the edge of the first fixed connection piece 2a (the edge of the first fixed connection piece 2a facing the second fixed connection piece 2b, namely the illustrated first edge 26) may be provided with a recess 20, the second The edge of the fixed connection piece 2b (the edge of the second fixed connection piece 2b facing the first fixed connection piece 2a, that is, the second edge 28 shown) is provided with a protrusion 22 that cooperates with the recess 20, and is realized by the recess 20 and the protrusion 22 Clamping and matching, simple structure and convenient processing.
  • the edge of the first fixed connecting piece 2a may also be arranged in a form in which the recesses 20 and the protrusions 22 are distributed at intervals, and accordingly, the second fixed connecting piece 2b is arranged in a form in which the protrusions 22 and the recesses 20 are distributed at intervals.
  • the recess 20 has a certain depth along the thickness direction of the first fixed connecting piece 2a, and along the thickness direction of the first fixed connecting piece 2a, the recess 20 is open on at least one side, so that the first fixed connecting piece 2a and the second fixed connection
  • the piece 2b can be installed and adjusted in the thickness direction of the connection piece 2;
  • the protrusion 22 has a certain thickness along the thickness direction of the second fixed connection piece 2b, and the thickness of the protrusion 22 is not greater than the thickness of the second fixed connection piece 2b to form a height Adjust the space.
  • the recess 20 penetrates the first fixed connection piece 2a along the thickness direction of the first fixed connection piece 2a, and the thickness of the protrusion 22 and the second fixed connection piece 2b is the same, which further simplifies the first fixed connection piece 2a and the second fixed connection
  • the structure of the sheet 2b maximizes the thickness of the connection between the first fixed connection sheet 2a and the second fixed connection sheet 2b, ensures the connection strength of the two, and prevents the connection portion from breaking due to the expansion force of the battery.
  • the recess 20 includes two inner side walls 200, and a bottom wall 202 connecting the two inner side walls 200.
  • the bottom wall 202 is away from the first edge 26 and connected to the first edge 26 through the inner side wall 200;
  • the protrusion 22 includes two outer sides The wall 220, and the top wall 222 connecting the two outer side walls 220, the top wall 222 is away from the second edge 28 and connected to the second edge 28 through the outer side wall 220;
  • the inner side wall 200 is in contact with the outer side wall 220, along the extension of the connecting piece 2 In the direction, the first fixed connection piece 2a and the second fixed connection piece 2b are constrained and guided to prevent relative rotation of the first fixed connection piece 2a and the second fixed connection piece 2b during the installation process.
  • the inner side wall 200 and the outer side wall 220 may be engaged with each other through a tooth structure, so that the first fixed connection piece 2a and the second fixed connection piece 2b are engaged with each other, the connection is reliable, and it is not easy to loosen ;
  • the tooth-like structure extends in the thickness direction of the connection piece 2, so that the first fixed connection piece 2a and the second fixed connection piece 2b can be installed and adjusted in the thickness direction of the connection piece 2.
  • the inner side wall 200 and the outer side wall 220 cooperate with each other through a collapsible structure, so that the first fixed connection piece 2a and the second fixed connection piece 2b are engaged with each other, so that the inner side wall 200 and The outer side wall 220 is kept flat or gentle to avoid stress concentration. Specifically, in the direction away from the bottom wall 200, the distance between the two inner side walls 200 gradually decreases; in the direction away from the top wall 222, the distance between the two outer side walls 220 gradually decreases.
  • the recess 20 includes a dovetail groove
  • the protrusion 22 includes a dovetail block
  • the overall structure simplifies the processing and installation operations.
  • the angle between the inner side wall 200 and the bottom wall 202 is the first angle
  • the angle between the outer side wall 220 and the top wall 222 is the second angle, in order to ensure the first fixed connecting piece 2a and the second fixed
  • the connection strength of the connecting piece 2b, the angle between the second included angle and the first included angle should be equal, so that the inner side wall 200 and the outer side wall 220 can be completely attached.
  • the first included angle is 45°-85°. When the first included angle is less than 45°, stress concentration is likely to cause cracking; when the first included angle is greater than 85°, the snap-fit fit is likely to slip off.
  • the first fixed connection piece 2a and the second fixed connection piece 2b when the first fixed connection piece 2a and the second fixed connection piece 2b are installed in place (respectively connected to different battery poles 10), the first fixed connection piece 2a and the second fixed connection piece 2b can be formed into a fixed connection by welding, To prevent the first fixed connecting piece 2a and the second fixed connecting piece 2b from moving or loosening in the thickness direction of the connecting piece 2 during use.
  • a gap 24 is formed between the bottom wall 202 and the top wall 222, and the laser welding is performed at the gap 24, and the laser is repeatedly reflected in the gap 24, which increases the absorption rate of the connection sheet 2 to the laser, thereby reducing the welding power.
  • this welding method can reduce welding spatter by more than 90%.
  • the metal on both sides of the gap 24 melts and fills the gap 24; after the welding is completed, a weak depression is formed at the gap 24 (see FIG. 8).
  • the gap 24 may be a structure with a wide upper width and a narrower width (such as an inverted trapezoid, see FIG. 7) or a structure with a uniform upper and lower width (such as a rectangle, see FIG. 6) to ensure multiple reflections of the laser light within the gap 24, thereby Increase the absorption rate of the connecting plate 2 to the laser.
  • the upper bottom angle of the gap 24 is 45° to 90°.
  • the gap 24 is rectangular 240.
  • the minimum width ⁇ x of the gap 24 is 0.3 mm to 1.5 mm, which is beneficial to the welding operation of the first fixed connection piece 2 a and the second fixed connection piece 2 b and reduces welding spatter.
  • the minimum width ⁇ x of the gap 24 is less than 0.3mm, the laser spot and welding accuracy requirements increase the difficulty of welding; when the minimum width ⁇ x of the gap 24 is greater than 1.5mm, it will reduce the number of laser reflections in the gap 24 and reduce laser absorption rate.
  • the gap 24 is located on the top of the battery pole 10 and does not exceed the edge of the battery pole 10, so that the welding part is located on the top of the battery pole 10, which increases welding safety and prevents welding spatter or welding penetration from directly acting on the battery top cover.
  • the second fixed connection piece 2b may include a transition connection piece 2c and a third fixed connection piece 2d.
  • the protrusion 22 is formed on the transition connection piece 2c.
  • a fixed connecting piece 2a is connected to the third fixed connecting piece 2d, which increases the applicable range of the connecting piece 2.
  • the adjustment range of the connection plate 2 to the height difference of the battery is increased; on the other hand, the connection plate 2 can be reliably connected to more than two battery poles 10 at the same time, that is, the transition connection plate 2c and the first
  • the three fixed connection pieces 2d may be connected to different battery poles 10, respectively.
  • the two ends of the transition connection piece 2c are respectively snap-connected to the first fixed connection piece 2a and the third fixed connection piece 2d.
  • the transition piece 2c is provided with a protrusion 22 toward the end of the first fixed connection piece 2a; the transition piece 2c is provided with a projection 22 or depression 20 toward the end of the third fixed connection piece 2d, accordingly, the third fixed connection piece 2d can be provided The recess 20 or the protrusion 22 fitted in the transition piece 2c.
  • the transition connecting pieces 2c can be arranged in multiple pieces along the extending direction of the connecting pieces 2, and are connected to each other in turn by a clamping structure.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Mounting, Suspending (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本申请提供了一种电池模组，其包括多个二次电池和连接片，多个所述二次电池沿厚度方向依次排列，且每个所述二次电池顶部设有电池极柱，所述连接片设置于所述二次电池的顶部，所述连接片与至少两个所述电池极柱连接以电连接至少两个所述二次电池，其中，所述连接片包括第一固定连接片和第二固定连接片，沿所述连接片的延伸方向，所述第一固定连接片和所述第二固定连接片卡接配合。本申请可以解决连接片与电池极柱之间的连接可靠性问题。

Description

电池模组
本申请要求于2018年12月26日提交中国专利局、申请号为201822197254.3、发明名称为“电池模组”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及储能器件技术领域，尤其涉及一种电池模组。
背景技术
电池模组中，需要对多个二次电池进行电连接以满足使用过程中的参数要求。而二次电池制造过程中存在误差，且电池模组组装过程中存在误差，导致连接片与电池极柱之间的间隙不均匀，当连接片与电池极柱之间的间隙过大时，易造成连接片虚焊。
申请内容
本申请提供了一种电池模组，以解决连接片与电池极柱之间的连接可靠性问题。
本申请提供了一种电池模组，其包括：
多个二次电池，多个所述二次电池沿厚度方向依次排列，且每个所述二次电池顶部设有电池极柱；
连接片，设置于所述二次电池的顶部，所述连接片与至少两个所述电池极柱连接以电连接至少两个所述二次电池；
其中，所述连接片包括第一固定连接片和第二固定连接片，沿所述连接片的延伸方向，所述第一固定连接片和所述第二固定连接片卡接配合。
可选地，所述第一固定连接片的边缘设有凹陷，所述第二固定连接片的边缘设有与所述凹陷配合的凸起。
可选地，所述第二固定连接片包括过渡连接片和第三固定连接片，所述凸起形成在所述过渡连接片上，所述过渡连接片将所述第一固定连接片与所述第三固定连接片连接。
可选地，所述凹陷沿所述第一固定连接片的厚度方向贯穿所述第一固定连接片，所述凸起与所述第二固定连接片的厚度一致。
可选地，所述凹陷包括两个内侧壁，以及连接两个所述内侧壁的底壁；
所述凸起包括两个外侧壁，以及连接两个所述外侧壁的顶壁；
所述内侧壁与所述外侧壁接触配合。
可选地，所述内侧壁与所述外侧壁通过齿状结构相互啮合，所述齿状结构沿所述连接片的厚度方向延伸。
可选地，沿背离所述底壁的方向，两个所述内侧壁之间的距离逐渐减小；沿背离所述顶壁的方向，两个所述外侧壁之间的距离逐渐减小。
可选地，所述凹陷包括燕尾槽，所述凸起包括与所述燕尾槽配合的燕尾块。
可选地，所述底壁与所述顶壁之间形成有间隙。
可选地，所述间隙位于所述电池极柱的顶部，且不超出所述电池极柱的边缘。
本申请提供的技术方案可以达到以下有益效果：
本申请提供的电池模组包括多个二次电池，多个二次电池通过连接片实现串联和/或并联；其中，连接片包括第一固定连接片和第二固定连接片，第一固定连接片和第二固定连接片分别连接于不同的电池极柱，通过连接片的分体设置使得第一固定连接片和第二固定连接片与电池极柱的连接面能够位于高度不同的平面，可以吸收电池沿高度方向的误差，保证连接片与电池极柱可靠连接；沿连接片的延伸方向，第一固定连接片和第二固定连接片卡接配合，增加了第一固定连接片与第二固定连接片连接的可靠性，防止在电池膨胀力作用下，第一固定连接片与第二固定连接片脱开。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性的，并不能限制本申请。
附图说明
图1为本申请实施例提供的电池模组的结构示意图；
图2为图1所示电池模组的俯视图；
图3为本申请实施例提供的电池模组的另一种结构示意图；
图4为本申请实施例提供的连接件的一种局部结构图；
图5为本申请实施例提供的连接件的另一种局部结构图；
图6为本申请实施例提供的连接件的一种剖面结构示意图；
图7为本申请实施例提供的连接件的另一种剖面结构示意图；
图8为图7所示连接件焊接完成后的结构示意图。
附图标记：
1-二次电池；
10-电池极柱；
2-连接片；
2a-第一固定连接片；
2b-第二固定连接片；
2c-过渡连接片；
2d-第三固定连接片；
20-凹陷；
200-内侧壁；
202-底壁；
22-凸起；
220-外侧壁；
222-顶壁；
24-间隙；
26-第一边缘；
28-第二边缘。
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本申请的实施例，并与说明书一起用于解释本申请的原理。
具体实施方式
下面通过具体的实施例并结合附图对本申请做进一步的详细描述。
在本申请的描述中，除非另有明确的规定和限定，术语“第一”、“第二”、“第三”、“第四”仅用于描述的目的，而不能理解为指示或暗示相对重要性；除非另有规定或说明，术语“多个”是指两个或两个以上； 术语“连接”、“固定”等均应做广义理解，例如，“连接”可以是固定连接，也可以是可拆卸连接，或一体地连接，或电连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
本说明书的描述中，需要理解的是，本申请实施例所描述的“上”、“下”、“左”、“右”等方位词是以附图所示的角度来进行描述的，不应理解为对本申请实施例的限定。此外，在上下文中，还需要理解的是，当提到一个元件连接在另一个元件“上”或者“下”时，其不仅能够直接连接在另一个元件“上”或者“下”，也可以通过中间元件间接连接在另一个元件“上”或者“下”。
如图1-图8所示，本申请实施例提供了一种电池模组，其包括多个二次电池1和连接片2。多个二次电池1沿厚度方向依次排列，围绕多个二次电池1可以设置固定装置以固定二次电池1，每个二次电池1的顶部设有电池极柱10；连接片2设置于二次电池1的顶部，连接片2与至少两个电池极柱10，以电连接至少两个二次电池。其中，连接片2包括第一固定连接片2a和第二固定连接片2b，第一固定连接片2a和第二固定连接片2b分别连接于不同的电池极柱10，通过连接片2的分体设置使得第一固定连接片2a和第二固定连接片2b与电池极柱10的连接面能够位于高度不同的平面，可以吸收电池沿高度方向的误差，保证连接片2与电池极柱10可靠连接；沿连接片2的延伸方向(与连接片2的厚度方向垂直或近似垂直的方向)，第一固定连接片2a和第二固定连接片2b卡接配合，增加了第一固定连接片2a与第二固定连接片2b连接的可靠性，防止在电池膨胀力作用下，第一固定连接片2a与第二固定连接片2b脱开，导致连接片2失效。
具体地，上述第一固定连接片2a与第二固定连接片2b二者当中，其中一者可以设置有卡接孔，另一种可以设有与卡接孔配合的卡接块。卡接孔沿连接片2的厚度方向具有一定深度，卡接块沿连接片2的厚度方向具有一定厚度；沿连接片2的厚度方向，由于卡接块和卡接孔配合的导向作用，第一固定连接片2a和第二固定连接片2b能够实现安装，并吸收电池高度方向的误差；沿连接片2的延伸方向，由于卡接块和卡接孔配合的卡 接作用，第一固定连接片2a和第二固定连接片2b无法脱开，确保连接片2的可靠性。
优选地，如图3所示，第一固定连接片2a的边缘(第一固定连接片2a朝向第二固定连接片2b的边缘，即图示第一边缘26)可以设有凹陷20，第二固定连接片2b的边缘(第二固定连接片2b朝向第一固定连接片2a的边缘，即图示第二边缘28)设有与凹陷20配合的凸起22，通过凹陷20与凸起22实现卡接配合，结构简单，加工方便。可以理解地，第一固定连接片2a的边缘也可以设置成凹陷20和凸起22间隔分布的形式，相应地，第二固定连接片2b设置成凸起22与凹陷20间隔分布的形式。
其中，凹陷20沿第一固定连接片2a的厚度方向具有一定深度，沿第一固定连接片2a的厚度方向，凹陷20至少一侧敞口，以使第一固定连接片2a和第二固定连接片2b能够沿连接片2的厚度方向安装和调节；凸起22沿第二固定连接片2b的厚度方向具有一定厚度，凸起22的厚度不大于第二固定连接片2b的厚度，以形成高度调节空间。
优选地，凹陷20沿第一固定连接片2a的厚度方向贯穿第一固定连接片2a，凸起22与第二固定连接片2b的厚度一致，进一步简化第一固定连接片2a与第二固定连接片2b的结构，且使第一固定连接片2a和第二固定连接片2b的卡接的厚度达到最大，确保二者的连接强度，防止在电池膨胀力的作用下导致卡接部位出现断裂。
进一步地，凹陷20包括两个内侧壁200，以及连接两个内侧壁200的底壁202，底壁202远离第一边缘26且通过内侧壁200连接第一边缘26；凸起22包括两个外侧壁220，以及连接两个外侧壁220的顶壁222，顶壁222远离第二边缘28且通过外侧壁220连接第二边缘28；内侧壁200与外侧壁220接触配合，沿连接片2的延伸方向，对第一固定连接片2a与第二固定连接片2b形成约束和导向，防止安装过程中，第一固定连接片2a和第二固定连接片2b发生相对转动。
参见图4，在一种实施例下，内侧壁200与外侧壁220可以通过齿状结构相互啮合，使第一固定连接片2a和第二固定连接片2b实现卡接配合，连接可靠，不易松动；齿状结构沿连接片2的厚度方向延伸，从而使第一固定连接片2a和第二固定连接片2b能够沿连接片2的厚度方向安装和调 节。
参见图5，在另一种实施例下，内侧壁200与外侧壁220通过收口状结构相互配合，使第一固定连接片2a与第二固定连接片2b实现卡接配合，使内侧壁200和外侧壁220保持平整或平缓，避免产生应力集中。具体地，沿背离底壁200的方向，两个内侧壁200之间的距离逐渐减小；沿背离顶壁222的方向，两个外侧壁220之间的距离逐渐减小。
优选地，当内侧壁200与外侧壁220通过收口状结构相互配合时，凹陷20包括燕尾槽，凸起22包括燕尾块，使第一固定连接片2a和第二固定连接片2b具有简单整齐的整体结构，简化加工和安装操作。其中，内侧壁200与底壁202之间的夹角为第一夹角，外侧壁220与顶壁222之间的夹角为第二夹角，为确保第一固定连接片2a与第二固定连接片2b的连接强度，第二夹角与第一夹角的角度应相等，从而使内侧壁200与外侧壁220能够完全贴合。优选第一夹角为45°～85°，当第一夹角小于45°时，容易产生应力集中导致开裂；当第一夹角大于85°时，容易导致卡接配合滑脱。
其中，第一固定连接片2a和第二固定连接片2b安装到位(分别与不同的电池极柱10连接)时，第一固定连接片2a与第二固定连接片2b可以通过焊接形成固定连接，防止使用过程中，第一固定连接片2a与第二固定连接片2b沿连接片2的厚度方向发生相对移动或松脱。
优选地，底壁202与顶壁222之间形成有间隙24，在间隙24处进行激光焊接，激光在间隙24内反复反射，增加了连接片2对激光的吸收率，从而降低了焊接功率，由此控制焊接飞溅，通过试验验证，该焊接方式可以将焊接飞溅减少90％以上。焊接时，间隙24两侧的金属融化并填充间隙24；焊接完成后，间隙24处形成微弱凹陷(参见图8)。
更优选地，间隙24可以为上宽下窄的结构(例如倒梯形，参见图7)或上下宽度一致的结构(例如矩形，参见图6)，确保激光在间隙24内的多次反射，从而增加连接片2对激光的吸收率。其中，间隙24的上底角为45°～90°，当上底角小于45°时，激光在间隙24内的反射次数减少，导致连接片对激光的吸收率降低；当上底角大于90°时，间隙24处熔融金属的填充量不足，且易造成熔深过大导致焊穿。其中，当上底角恰好为 90°时，间隙24为矩形240。
进一步地，间隙24的最小宽度Δx为0.3mm～1.5mm，有利于第一固定连接片2a与第二固定连接片2b的焊接操作，且减少焊接飞溅。当间隙24的最小宽度Δx小于0.3mm时，对激光光斑和焊接精度要求，增加焊接难度；当间隙24的最小宽度Δx大于1.5mm时，会减少激光在间隙24内的反射次数，降低激光吸收率。
优选地，间隙24位于电池极柱10的顶部，且不超出电池极柱10的边缘，使焊接部位位于电池极柱10的顶部，增加焊接安全，避免焊接飞溅或焊接焊穿直接作用于电池顶盖。
进一步地，如图1和图2所示，上述第二固定连接片2b可以包括过渡连接片2c和第三固定连接片2d，凸起22形成在过渡连接片2c上，过渡连接片2c将第一固定连接片2a与第三固定连接片2d连接，增加连接片2的适用范围。一方面，增加了连接片2对电池高度差的调节范围；另一方面，能够使连接片2同时与两个以上的电池极柱10均实现可靠连接，也就是说，过渡连接片2c和第三固定连接片2d可以分别连接于不同的电池极柱10。
具体地，过渡连接片2c的两端分别卡接连接第一固定连接片2a和第三固定连接片2d。过渡连接片2c朝向第一固定连接片2a的一端设置凸起22；过渡连接片2c朝向第三固定连接片2d的一端设置凸起22或凹陷20，相应地，第三固定连接片2d可以设置于过渡连接片2c配合的凹陷20或凸起22。其中，过渡连接片2c沿连接片2的延伸方向可以设置成多片，并依次通过卡接结构相互连接。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (10)

  1. 一种电池模组，其特征在于，包括：
    多个二次电池，多个所述二次电池沿厚度方向依次排列，且每个所述二次电池顶部设有电池极柱；
    连接片，设置于所述二次电池的顶部，所述连接片与至少两个所述电池极柱连接以电连接至少两个所述二次电池；
    其中，所述连接片包括第一固定连接片和第二固定连接片，沿所述连接片的延伸方向，所述第一固定连接片和所述第二固定连接片卡接配合。
  2. 根据权利要求1所述的电池模组，其特征在于，所述第一固定连接片的边缘设有凹陷，所述第二固定连接片的边缘设有与所述凹陷配合的凸起。
  3. 根据权利要求2所述的电池模组，其特征在于，所述第二固定连接片包括过渡连接片和第三固定连接片，所述凸起形成在所述过渡连接片上，所述过渡连接片将所述第一固定连接片与所述第三固定连接片连接。
  4. 根据权利要求2所述的电池模组，其特征在于，所述凹陷沿所述第一固定连接片的厚度方向贯穿所述第一固定连接片，所述凸起与所述第二固定连接片的厚度一致。
  5. 根据权利要求2所述的电池模组，其特征在于，所述凹陷包括两个内侧壁，以及连接两个所述内侧壁的底壁；
    所述凸起包括两个外侧壁，以及连接两个所述外侧壁的顶壁；
    所述内侧壁与所述外侧壁接触配合。
  6. 根据权利要求5所述的电池模组，其特征在于，所述内侧壁与所述外侧壁通过齿状结构相互啮合，所述齿状结构沿所述连接片的厚度方向延伸。
  7. 根据权利要求5所述的电池模组，其特征在于，沿背离所述底壁的方向，两个所述内侧壁之间的距离逐渐减小；沿背离所述顶壁的方向，两个所述外侧壁之间的距离逐渐减小。
  8. 根据权利要求7所述的电池模组，其特征在于，所述凹陷包括燕尾槽，所述凸起包括与所述燕尾槽配合的燕尾块。
  9. 根据权利要求5所述的电池模组，其特征在于，所述底壁与所述 顶壁之间形成有间隙。
  10. 根据权利要求9所述的电池模组，其特征在于，所述间隙位于所述电池极柱的顶部，且不超出所述电池极柱的边缘。
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EP3675236B1 (en) 2023-06-14
US11139537B2 (en) 2021-10-05
US20200212403A1 (en) 2020-07-02
EP3675236A1 (en) 2020-07-01

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